ean13 is stored in product_product table:
id | ean13 | create_date | default_code | name_template | ... | active
----+---------------+----------------------------+--------------+---------------+------------+-------------------+-----------------+---------------+-----------+----------------------------+--------
32 | 2910000000185 | 2015-07-11 10:08:14.009873 | | FOOBAR1 | 1 | | 51 | | 1 | 2015-07-11 10:08:14.009873 | t
however, you can not recover ean13 from product_product attributes
print product_fields
[{'ean13': False, 'id': 32, 'name_template': u'FOOBAR1'}]
print product_id32.ean13
False
print product_id32.name_template
FOOBAR1
How do I recover ean13 value for a given product?